<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
   <script>
    let a = prompt('请输入用户名：')
    let b = prompt('请输入密码：')
    if (a ==='admin' && b==='123456')
    {alert("登录成功");}
    else
   {alert("登录失败");}
   </script> 
</body>
</html>